I've read about the double boost pressure rule before. Does this apply more as the engine gets closer to redline? And hold more true as a turbo increases in size?
The reason I ask is because I was able to hold 22psi with the stock VF40 actuator, but not as much to redline as a 1bar actuator. mweiner actually argued with me about not needing an upgraded actuator at my elevation (5280'). I tried explaining to him that the little actuator, having a small spring, just can't physically stay shut as the exhaust gasses pass by. However, after reading the double psi rule over and over, I wonder if other factors play into the accurateness of that rule since I was able to run more boost then 2.5 times the stock spring pressure (with an HTA68 on e85).